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Formation of Bulk Nanostructured Materials by Rapid Solidification

Published online by Cambridge University Press:  31 January 2011

W. H. Guo ,
L. F. Chua ,
C. C. Leung  and
H. W. Kui
W. H. Guo
Affiliation:
Department of Physics, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, People's Republic of China
L. F. Chua
Affiliation:
Department of Physics, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, People's Republic of China
C. C. Leung
Affiliation:
Department of Physics, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, People's Republic of China
H. W. Kui
Affiliation:
Department of Physics, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, People's Republic of China
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Abstract

When a eutectic melt is undercooled below its liquidus T1 by a critical amount, it undergoes metastable liquid-state spinodal decomposition. The resulting morphologies can be described as intermixing undercooled liquid networks of characteristic wavelength λ. At a temperature substantially below T1, λ can be <100 nm. When λ ≤ 100 nm, the undercooled liquid networks break up into nanometer-size droplets/strips driven apparently by surface tension. The morphologies of the tiny droplets/strips can be frozen by subsequent crystallization. The as-crystallized specimen is a nanostructured material. It is microvoid free and the size of the constituent grains is rather uniform. Two systems, Pd40.5Ni40.5P19 and Pd82Si18, were chosen to illustrate the synthesis process.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 7 , July 2000 , pp. 1605 - 1611
Copyright
Copyright © Materials Research Society 2000

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References

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